Audio Systems: dance band music, rca line output, back ground music

Question
we go out dancing and the bands that we see a lot of (in FL) are two persons, a guitarist and a singer.

The man uses a PC keyboard and a PC monitor. He punches some keys  and he gets what I call background music.  Then he supplements this music with his guitar and the singer sings along too.

Questions:  Is there a website I can go to where I learn more about this back ground music equipment that he uses?

What is the equipment called?

How does the music get into his equipment in the first place?

Or is it all too complicated for a non musician to understand?  Jim


Answer
It sounds a lot simpler than you think. He may be using a Mac, in which case it could be a program like Garage Band where he has the ability to record then playback whatever track he chooses from the computer to an external audio monitor. If he is using a PC there are numerous applications that you can buy and load on any computer. More involved would be if he uses an external sound card. If not he may well use the headphone jack output from his computer unless there is a high impedance RCA line output.

The output of the computer feeds a signal to a powered monitor that could very well have a microphone mixer built in. If as you say, those are the only two pieces of gear than that is probably the case. If there were a third piece of gear, a mixer, all signals are routed from the mixer to a powered monitor.

Here is one example of PC software for this use http://www.filesland.com/download/live-music.html